WO2014086773A1

WO2014086773A1 - Laser beam horizontal trueness testing device and corresponding method

Info

Publication number: WO2014086773A1
Application number: PCT/EP2013/075372
Authority: WO
Inventors: Charles Leopold Elisabeth Dumoulin; Marco Petermann
Original assignee: Leica Geosystems Ag
Priority date: 2012-12-05
Filing date: 2013-12-03
Publication date: 2014-06-12
Also published as: CN104838233A; EP2741049A1; EP2929291B1; US20150308825A1; EP2929291A1; US9644960B2; CN104838233B

Abstract

The invention relates to a laser beam horizontal trueness testing device (10) for a laser beam projection device (20) for construction and/or interior design work. The laser beam projection device (20) is equipped with a beam self-leveling functionality. The laser beam horizontal trueness testing device (10) has a telescope (1) with an attenuating filter (2), a magnifying objective (3), and a flat image sensor (5) for capturing an image of a laser beam (L) incident on the objective (3). Components of the laser beam horizontal trueness testing device (10) further include a natural inclination compensator (6) and an analyzing unit (7) which is designed to automatically ascertain an image position of the laser beam (L) captured in the image by processing the image. According to the invention, the flat image sensor (5) is arranged on an image plane (4) of the objective (3), and the analyzing unit (7) is additionally designed to quantify the laser beam horizontal trueness by converting the ascertained image position into a laser beam inclination value using a conversion rule relating to calibration parameters which depend on a position of the image sensor (5) in the telescope (1).

Description

Laser beam horizontality fidelity checking device and same procedure

The invention relates to a laser beam horizontality fidelity checking device for a laser beam projection apparatus for work in construction and / or interior design, wherein the laser beam projection device is equipped with a beam self-leveling functionality. The

Laser beam projection device is in particular as a

Rotary laser or a line or point laser

educated. The laser beam horizontality verifying device has a telescope with a telescope

Attenuation filter, an enlarging lens and a planar image sensor for taking an image of a laser beam incident on the objective. Components of the laser beam horizontality

Verification device are also a self-inclination compensator and an evaluation unit, which is designed for automatically determining an image position of the laser beam recorded in the image by means of image processing.

Laser beam projection devices, such as

Point lasers, line lasers or, in particular, rotary lasers, are used in particular in construction or interior construction, for example for height marking of walls. A rotating laser marks one by its rotating laser beam

Reference plane. In this case, the laser beam itself

For example, be emitted point, line or fan-shaped. The laser light can be generated as a continuous light or pulsed. It is important that the laser beam is evenly distributed, in particular horizontally scattered, that is, exactly in the intended plane

remains in order to exclude miss marks. To ensure this, conventional such lasers are in usually equipped with a beam self-leveling functionality. To fulfill such a beam self ^¬ horizontierfunktionalität various technical solutions are known, both mechanical and

optical nature. For example, the laser core module can be suspended pendulum, so that a

Horizontality loyalty can be generated by utilizing gravity. The laser can also work with one

Tilt sensor, in the simplest case, for example, a bubble sensor, be equipped whose display or

Signal can be read and used as an output variable for an active adjustment of the laser. Typically, a first adjustment of the Horizontalitätstreue and calibration of the beam Selbsthorizontierfunktionalität manufacturer side before the delivery of the laser.

Due to various external influences, such as temperature and humidity fluctuations, mechanical shocks such as vibrations, etc., the

Adjust the laser but change. Therefore, it is necessary at regular intervals or when necessary to check the level and / or the horizontality of the laser and its beam Selbsthorizontierfunktionalität, recalibrate and the laser if necessary

rejuvenate. To accomplish this task, laser beam horizontality-fidelity checking devices are known and described in the prior art. Usually, these known devices comprise as basic components a telescope and a self-inclination compensator with which it is intended to ensure that the optical axis of the telescope is always aligned horizontally. This, of course, is needed to make the checker itself perfect to be able to align horizontally so that the

Horizontality of another device can be controlled at all. In a known

Laser Beamhorizontalitätstreue Überprüf orrichtung, with reference to Fig. La in more detail below

will be described, the telescope has one

Input lens having an image plane in the far, i. at an infinite distance, objects are displayed. In the extension direction of the optical axis of the lens is the image plane

Subsequently, for an observer, an eyepiece is arranged, behind which, for a review of the horizontal laser beam fidelity of a laser beam projection apparatus, a planar image sensor, typically a camera, is arranged, onto which an incident laser beam is imaged. Usually, the image sensor is arranged with its center on the optical axis of the lens. In front of the lens, a diaphragm is mounted with a central translucent opening on the optical axis of the lens, for example screwed onto the telescope. Such an available on the market VerificationVorrichtung is equipped for example with an attached in front of the lens, adjustable in two positions optical filter, whereby the intensity incident in the telescope in two stages

can be reduced.

Such a commercially available verification device has a number of disadvantages. On the one hand, the accuracy that can be achieved with the review of the

Laserstrahlhorizontalitätstreue a laser beam projection device very limited, as explained in more detail below. On the other hand, also the implementation such a review consuming. A first group of drawbacks is the imaging of the laser beam through an eyepiece. An eyepiece usually has only a small diameter and a short focal length, so a strong curvature of the lens surface. This inevitably generates significant optical distortions over the extent of the field of view, with the disturbance in the center of the eyepiece being the lowest. In addition, typically, an eyepiece is slidably disposed in the axial direction over a certain distance to allow adaptation to the specific characteristics of a viewer's eye. As a result, only an approximate, but hardly a highly accurate positioning of the eyepiece is inevitably possible. Particularly disadvantageous for a measurement result is a relatively easily occurring, unintentional tilting of the eyepiece with respect to the optical axis of the objective.

As a result, an offset of an incident laser beam, which enters the telescope horizontally through the objective and should actually be imaged onto the intersection of the optical axis with the planar image sensor, is generated on the image sensor, which then falsely

actually nonexistent deviation of the

Laser beam from the horizontal course indicated. Axial movements or incorrect positioning of the eyepiece

additionally affect the collimation of the laser beam on the image sensor. In addition, this device is considerably susceptible to vibration, all the more

stronger, farther from the image plane of the

Image sensor is arranged. This device allows only principal, i. "J a-no" checks if one

Deviation from the horizontal course of the laser beam is present. Any kind of quantification of such

Deviation and even a more detailed analysis to determine the Cause of such a deviation is with this

Device not possible. Therefore, upon detecting a deviation of the emitted laser light of an examined laser beam projection apparatus from the

Horizontality these well-known Laserstrahlhorizontalitäts- fidelity Verification device not be used to nachj ustieren with their help the laser beam projection device, but this must then typically be sent to the service of the manufacturer. In addition, such a verifying device, in particular because of the trouble-prone positioning of the imaging on the image sensor eyepiece itself

regularly recalibrated and readjusted if necessary, for which in known such devices

Service is required at the manufacturer.

In addition to the described variety of disadvantages

With regard to the achievable optical measurement accuracy, this device for checking the laser beam horizontal fidelity of a laser beam projection device for an operator is only with great effort

usable. The mounted in front of the optical input of the telescope aperture with its central opening is essential for this device to a

Distinction of a to be corrected, from the

provided horizontality divergent incidence of a laser beam from an actually horizontal

arriving, ie parallel to the optical axis

to allow extending, but perpendicular offset laser beam. The latter would also result in this device to an offset of the point of incidence of the laser beam on the image sensor. It would actually be necessary, the aperture as possible small to improve the distinctiveness and thus the measurement accuracy of the device. For the use of the device, however, this means that a laser to be checked with regard to its laser beam horizontality with its optical exit opening for the laser

Laser beam aligned very accurately to the aperture, ie, if desired horizontal laser beam path at the height of the optical axis of the lens must be positioned. This means high demands on a user for accurate positioning of the re ^¬ fenden laser beam projection device. This described problem of mutual height adjustment and

Alignment becomes invisible when checking

Laser beams, such as infrared rays, made even more difficult, since here the visual control of a user or the visible reference in the preparation of the

checking device in front of the telescope is missing.

The known Laserstrahlhorizontalitätstreue- VerificationVorrichtungen thus have not only one

insufficient optical measurement accuracy and only a very limited usability and thus only little benefit of the measurement results obtained with such a device, but are to be operated by a user even with great effort. The object of the present invention is to overcome these disadvantages. In particular, it is an object of the invention to provide an easy-to-use laser beam horizontality scattering inspection apparatus for a laser beam projection apparatus equipped with beam self-horizontalization functionality. A special task is one

Laser beam horizontality verifying device

which also enables quantitative measurements of the level of fidelity or horizontality fidelity of the laser emission and this verification device

preferably for any required

Readjustment of an examined laser beam projection device can be used.

These tasks are achieved through the realization of

characterizing features of the independent claims. Features that the invention in alternative or

educate in an advantageous manner, are the dependent

To claim.

The invention provides a Laserstrahlhorizontalitätstreue- Verification device for a laser beam projection device for works in construction and / or interior design, wherein the laser beam projection device is equipped with a beam Selbsthorizontierfunktionalität. The

Laser beam projection device is in particular as a

Rotary laser or a line or point laser

Attenuation filter, an enlarging lens and a planar image sensor for taking an image of a laser beam incident on the objective. Components of the laser beam horizontality scattering checking device are also a self-inclination compensator and an evaluation unit, which is designed to automatically determine an image position of the laser beam recorded in the image by means of image processing. According to the invention, the planar image sensor, bereitge ^¬ represents, for example, as a CMOS or CCD chip, and preferably with Lichtempfondlichkeit not only in

visible, but also infrared spectral range, whereby the use of the device with infrared

emitting devices such as total stations is arranged in an image plane of the lens, and the

Evaluation unit is additionally designed to carry out a quantification of the Laserstrahlhorizontalitätstreue with a translation of the determined image position in a laser beam slope value on the basis of a translation ^¬ rule, which is associated with Kalibrierparametern, which are dependent on a position of the image sensor in the telescope. In comparison with the prior art, the image sensor according to the invention is arranged in the image plane of the telescope objective. Thus, assuming horizontal alignment of the laser beam horizontality-fidelity verifier itself, each horizontally incident laser beam, even if incident parallel to the optical axis of the objective but with a perpendicular offset, is imaged onto the image sensor on the optical axis, if within the Aperture and is captured by the lens of the telescope. Therefore, the telescope is formed without glare with its lens, so that the entire or at least a large area of the cross-sectional area of the lens can be used as an aperture.

Thus, it is only necessary to align the laser beam on the aperture of the lens, but not more to meet a more or less small opening of a pre-screwed diaphragm, which required the effort for the Positioning of a laser beam projection device to be checked considerably reduced.

The laser beam is transmitted directly to the lens via the lens

Imaged image sensor in the image plane, without intervening intermediate image plane and eyepiece. This eliminates all the problems associated with accurate positioning of an eyepiece required for satisfactory measurement accuracy, as well as noise susceptibility to vibration. Through the invention-specific features a quantification of the Laserstrahlhorizontalitätstreue with a translation of the image position determined in a laser beam-tilt value based on a translation ^¬ rule, associated with calibration parameters, which are dependent on a position of the image sensor in the telescope, is made possible.

By the latter additional features of

Evaluation unit is advantageous, in contrast to the prior art, allows to quantify the extent of a deviation of a laser beam from the Horizontalitätstreue and even still, in particular based on the

Quantitative nature of the particular deviation data to gain evidence for a diagnosis and identification of the cause of such deviations and, where appropriate, to allow a review of a readjustment of the laser at the user.

According to one embodiment of the inventive

Laser beam horizontality checking device, the attenuation filter is designed to provide a plurality of different degrees of attenuation is, from which user one each

Degree of attenuation selectable and adjustable or by evaluation of a test image, which is recorded by the incident laser beam in the lens, a

Degree of attenuation is automatically selected and set. Preferably, the attenuation filter is designed such that in each case a degree of attenuation is steplessly ^selectable and adjustable in a wide attenuation range. It is particularly advantageous if the attenuation filter has at least one rotatably arranged linear polarizer, in particular two or more mutually rotatably arranged linear polarizers. In the case of linearly polarized laser radiation to be detected, a single linear polarizer is already sufficient to set the widest possible attenuation range, between 0% (parallel polarization) and 100% (crossed polarization). Of

It is further preferred that the attenuation filter extends substantially uniformly over the entire lens cross-sectional area as an aperture.

Advantageously, the telescope are so glare-free

formed and the image sensor and the lens arranged so cooperatively in the telescope that through the

Image sensor an incident laser beam over at least a large part of the lens cross-sectional area is detected as an aperture, in particular substantially over the entire obj ektivquerschnittfläche.

The self-inclination compensator of the inventive

For example, a laser beam horizontality verifying device may be formed as an opto-mechanical one

Self-leveling device with an opto-optical array arranged in the beam path of the telescope between the objective and the image sensor. mechanical element, in a simple case eg as a bubble sensor or vial, for self-horizontalization of the optical axis of the telescope, or as an electronic tilt detector with a high precision

Inclination sensor for determining a dependent of a current inclination position of the telescope telescope inclination value, wherein the telescope inclination value is automatically taken into account by the evaluation unit in an automatically performed translation of the image position in a laser beam slope value.

According to a possible embodiment of the invention, a focusing element arranged downstream of the objective in the beam path is additionally provided in the telescope and axially

is adjustable. According to a further embodiment, the telescope has a beam splitter arranged in the beam path

Dividing the beam path into a first channel and a second channel in such a way that in the first channel, a first image plane of the lens and in the second channel, a second image plane of the lens is generated. In this case, the image sensor is arranged in the first image plane, and in the second image plane are an indicator of the

optical axis-bearing optics, in particular with crosshair, and an optics downstream of the eyepiece arranged with the eye of a user viewing the intermediate image generated in the second image plane arranged. For this embodiment, the exact adjustment of the indicator or reticle in the second image plane is typically carried out by the manufacturer, wherein in general a later readjustment is not required because of the fixed, not susceptible to interference positioning within the telescope. Also the positioning of the image sensor in The first image plane is not susceptible to malfunction, so that typically after a Erstj ustierung and calibration of the device at the manufacturer subsequent adjustments and calibrations are no longer required. Calibration parameters stored in the evaluation unit stand, for example, for the imaging position of the optical axis of the objective in the image and, in particular, a direction in the image which is hypothetical for a

Horizontality error caused - offset direction of a laser beam impact position on the image sensor is.

For the translation of the determined image position into a laser beam slope value, an image is preferred

between the image position and the imaging position in that direction, which is referred to as

Direction is assumed or stored in the Kalibrierparametern, which stands for a - hypothetically caused by a pure horizontality error - offset direction of a laser beam impact position on the image sensor. This distance can be translated into the laser beam slope value, in particular according to a translation factor defined by the objective mapping ratio.

According to a further embodiment of the invention, the evaluation unit can be called up in a memory for

different laser beam cross-sectional shapes each have a pattern, in particular a template stored. Further, according to this embodiment, a pattern corresponding to the laser beam cross-sectional shape of the incident laser beam is user-selectable or automatically selected by image processing with feature recognition. It is accompanied by the evaluation unit the determination of the image position of the selected pattern using a best-fit method in the image with the recorded laser beam matched, in particular with subpixel accuracy, and based on the matching position of the pattern in the image, the image position of the laser beam recorded in the image is determined. The invention makes it possible that this can be done in particular with subpixel accuracy, in particular for each stored pattern information

is cached, which defines a pattern inside, for the eventual determination of the image position

derivable pattern position within the pattern. Specifically, the information herein is the pattern defined pattern position or a defined pattern position determination algorithm, such as a pattern centroid determination algorithm.

According to a further embodiment, the

Furthermore, a functionality for checking a Laserstrahlneigungstreue especially for such a trained laser beam projection device, which defines a beam inclination function with user-selectable and - especially at will automatically adjustable - target inclination for the

Has laser beam. This relates in particular to a laser beam projection device designed as a tilt-rotation laser with automatic single or dual-slope mechanism. According to the invention, within the scope of the functionality for checking the laser beam inclination loyalty, after setting the defined target inclination for the laser beam on the laser beam projection device, a picture taken by the image sensor of the image in the lens incident laser beam can be triggered, and by the evaluation unit are automatically the following

Steps performed:

Determining an image position of the laser beam recorded in the image and

Quantification of the laser beam inclination with a translation of the determined image position into a

Laser beam slope value based on one of the

depend on stored calibration parameters

Translation rule, so that the resulting laser beam inclination value is comparable to the defined set on the laser beam projection device target inclination.

According to a further embodiment of the laser beam horizontality checking device according to the invention, the evaluation unit is designed as a control and evaluation unit and a functionality for checking the horizontal laser beam fidelity is automatically provided after triggering, within the scope of which controlled by the control and evaluation unit by the image sensor taking a picture of the incident laser beam into the lens automatically

and then automatically performing the determination and the quantification is started.

In particular, the functionalities for

Checking the laser beam azimuth fidelity or the laser beam inclination as provided after triggering fully automatic ^¬ expiring functionalities, and, controlled by the control and evaluation, take place by the image sensor taking a picture of the laser beam incident into the lens automatically initiates and then automatically performed the determination and the quantification started.

Another object of the invention is a system comprising an inventive Laserstrahlhorizontalitätstreue- screener and a beam-Selbsthorizon- animal functionality having laser beam projection ^¬ device for work in the construction and / or interior work,

in particular rotational laser or line or point laser, in particular wherein the Laserstrahlhorizontalitätstreue- Verification device and the laser beam projection device each having a data communication interface, and wherein the Laserstrahlhorizontalitätstreue- ^{VerprüvorVor ¬} direction for generating the laser beam inclination value dependent data and communication of these data the laser beam projection device is designed such that the beam leveling functionality, in particular beam self-horizontalization functionality, of the laser beam projection device can be recalibrated on the basis of the data obtained therefrom, in particular wherein the laser beam projection device is automatically automatic

Re-calibration of its beam leveling functionality, in particular beam Selbsthorizontierfunktionalität is based on these data obtained.

A further subject of the invention is a method for checking the accuracy of the laser beam from a laser beam projection device having a beam self-horizontaling functionality, which is designed for work in building and / or interior construction, in particular

Rotary laser or line or point laser, the method being carried out with a telescope having

Cut filter, an enlarger-acting lens and a planar image sensor arranged in an image plane of the objective for acquiring an image from a laser beam incident into the objective, and compensating an inclination of the telescope, taking an image from an incident into the objective Laser beam, determining a picture position of the image

recorded laser beam based on image processing and quantifying the Laserstrahlhorizontalitätstreue with a translation of the determined image position into a laser beam slope value on the basis of a

Translation rule dependent on a position of the camera or the image sensor in the telescope

Calibration parameters related.

The developments and special features of the invention mentioned in connection with the device can also be applied analogously to the method according to the invention. The device according to the invention and the method according to the invention are further described below with reference to concrete in the drawings

Exemplary embodiments described in more detail by way of example, wherein further advantages of the invention will be discussed. In detail show:

Fig. 1a-b shows a laser beam horizontality scattering device and two known ones Embodiments of laser beam projection devices according to the prior art,

A schematic overview of a

according to the invention, the laser beam horizontality fidelity checking device used in the

Checking the laser beam horizontality fidelity of a laser beam projection apparatus;

3 shows an embodiment of an inventive

Laser beam horizontality fidelity checker,

4 shows another embodiment of a

laser beam horizontal accuracy test device according to the invention,

5 shows a representation of image data of

laser beam

6 shows an example of the processing of image data of the laser beam,

FIG. 7 shows an example of the detection of horizontal deviations of a rotating laser beam or rotating laser beam fan, FIG.

8 shows another example for the detection of horizontal deviations of a rotating laser beam or rotating laser beam fan,

9 shows an example of the detection of

Vertical deviations of a plane generated by a rotating laser in lay-down position or a vertical laser beam fan, Fig.10a b each an example of the measurement of

Horizontality fidelity of a laser beam

Projection device,

11 shows an example of the in Fig.

shown arrangement generated evidence

Horiziontalitätsabweichungen,

Fig.l2a-b an example of quantitative measurement results for an inventive measurement of a rotating laser and Fig.l3a-b each an example of real quantitative

Measurement results for an inventive measurement of a rotating laser.

Fig. 1a shows a laser beam horizontality scattering inspection device 10 'according to the prior art. The apparatus 10 'comprises a telescope 1' with a lens 3 having an image plane 4 in which, in the distance, i. at an infinite distance, objects are displayed. In the direction of continuation of the optical axis A of the objective 3, the image plane 4 is below for a

Viewers arranged an eyepiece 14, behind which for a review of the Laserstrahlhorizontalitätstreue a laser beam projection device, in particular a

Rotation laser or line or point laser, a

planar image sensor 5 ', typically a camera, is arranged, on which an incoming laser beam is imaged. Usually, the image sensor 5 'is arranged with its center on the optical axis A. In front of the lens 3, a shutter 15 is mounted with a very small, central transparent aperture 16 on the optical axis A of the lens 3, for example on the Telescope 1 'screwed on. Usually includes one

Laserstrahlhorizontalitätstreue Verification orrichtung according to the prior art also a self inclination compensator (not shown here), with which it should be ensured that the optical axis A is always aligned horizontally even with slightly inclined installation of the telescope.

Such a verifier, as commercially available, has a number of disadvantages

connected. On the one hand, the accuracy that can be achieved with respect to checking the accuracy of the laser beam horizontality of a laser beam projection device is very limited, as will be explained in more detail below. On the other hand, the implementation of such a review is complicated. A first group of drawbacks is the imaging of the laser beam through an eyepiece. An eyepiece points

usually a small diameter and a short focal length, so a strong curvature of the lens surface. As a result, inevitably significant optical

Distortions over the extent of the field of view generated, with the disturbance in the center of the eyepiece is the lowest. In addition, typically, an eyepiece is slidably disposed in the axial direction over a certain distance in order to adapt to the specific properties of a

To enable viewer's eye. This inevitably only an approximate, but hardly a highly accurate

Positioning of the eyepiece or positional stability during use of the eyepiece, possible. Particularly disadvantageous for a measurement result is the susceptibility of the telescope

in terms of unintentional tilting of the eyepiece with respect to the optical axis A in the use of the telescope. This will cause an offset of an incoming laser beam, which enters the telescope horizontally through the lens and should actually be imaged onto the intersection of the optical axis A with the planar image sensor 5 'on the image sensor 5' generated, which then falsely an actually not existing deviation of the

stronger, the farther away from the image plane 4 of the

Image sensor 5 'is arranged. This device allows only principal and not gradual checks. It can therefore only be determined whether there is a deviation from the horizontal course of the laser beam or not. Any kind of quantification of such a deviation from the horizontal incidence of a laser beam and even a more detailed analysis to determine the cause of such a deviation is not possible with this device. In addition to this variety of disadvantages in terms of achievable optical measurement accuracy is this

Device for checking the

Laserstrahlhorizontalitätstreue a laser beam projection device for an operator even at great expense usable. The front of the optical input of the

Telescope 1 'attached aperture 15 with its technically very small dimensioned central opening 16 is essential for this device to a

Distinguishing a deviating in its propagation direction of the intended horizontal laser beam of an actually horizontal, but offset from the optical axis A in height (ie parallel vertical) To allow laser beam. The latter would also result in this device to an offset of the point of incidence of the laser beam on the image sensor 5 '. Thus, it is advisable in this device of the prior art, to size this opening 16 as small as possible in order to exclude a height offset of incident laser beam and optical axis A and thus at all a clear measurability of one in his

Propagation direction of the intended horizontal deviating laser beam to allow. For the use of the device, however, this means that a laser to be checked with regard to its laser beam horizontality with its optical exit opening for the laser

Laser beam very close to the aperture 16

aligned, i. when desired horizontal

Laser beam path at the height of the optical axis A must be positioned. This means high

Requirements on a user and a lot of time for an exact positioning of the to be checked

Laser beam projection device relative to the telescope.

Fig. Lb shows two known embodiments of

Laser beam projection devices 20, each provided with a laser beam outlet opening 25, for emitting a horizontal, collimated laser beam L as a point 27 on a projection surface, or a horizontal

Laser beam fan for creating a horizontal line on a projection surface. Further embodiments of for a survey with the inventive

Laserstrahlhorizontalitätstreue-screener

Measurable laser beam projection devices, in particular also rotary lasers, are likewise known and adequately described in the prior art. Such laser beam Projection devices each have in a known manner

Mechanisms for providing self-leveling functionality which ensure that the laser beam is emitted in the horizontal direction despite slightly inclined installation of the device (for example, approximately in the region of + -5 ° tilt about the horizontal). In addition, channel lasers as point lasers also belong to such laser beam projection devices with self-alignment functionality. The device relating to the invention is now designed and created precisely to check in such laser beam projection devices, how faithful the self-leveling mechanism actually is or which

Directional deviations of the emitted laser beam from the true horizontal are actually present. 2 shows a schematic overview representation of a laser beam horizontality scattering checking device 10 according to the invention in use in checking the accuracy of the laser beam horizontality of a laser beam projection device 20. The laser beam L emerges from the laser beam projection device 20 at a height H 'above the ground. The optical axis A of the checking device 10 is at a height H above the ground.

In this schematically illustrated example, the optical axis A and the course of the laser beam L fall

together. However, this does not have to be the case for a laser beam horizontality checking device according to the invention, and in particular the heights H and H 'do not have to be the same size (as will be described in more detail below)

explained). In the illustrated example, both the inventive Laserstrahlhorizontalitätstreue checking device 10 as Also, the laser beam projection device 20, designed as a rotary laser, each mounted on a tripod three tripod. As essential components of the

Verification apparatus 10 is shown: a

Attenuation filter 2 at the optical input of the telescope 1, in front of the lens 3, which has an optical axis A

defines a planar image sensor 5, which in a

Image plane 4 is arranged, a (only on the basis of

following figures described in detail)

Self-inclination compensator and an evaluation unit 7 assigned to the checking device 10

Evaluation unit not, as shown here and in the fol ^¬ ing examples, be connected directly in physical contact with the telescope 1. The image sensor 5 can for example be formed as a CMOS chip or a CCD chip or PSD chip (such as a camera), and is preferential ^¬ example not only in the visible but also in the infrared spectral sensitive to light, so that even a

Measurement of infrared emitting laser is possible. Compared to the preceding with reference to FIG. 1

illustrated prior art, the image sensor 5 is arranged according to the invention in the image plane 4 and the focus set or adjustable (or the

Image sensor 5 relative to the lens 3 depending on the focal length so positioned) that parallel to each other and incident in the lens rays over the entire aperture of the lens coincide and be imaged in a same point on the image plane and thus by the image sensor in a single , the same pixel (which is then exactly for one

Incidence direction stands). This will cause everyone to be true to each other horizontally

incident laser beam L is imaged on the same point (or taking into account Azimutrichtungsschwankungen at least on a same line) on the image sensor 5, even if it arrives at a perpendicular offset to the optical axis A. Therefore, the telescope 1 is formed without glare with its lens 3, so that the entire or at least a large area of the cross-sectional area of the lens 3 can be used as an aperture. Thus, it is only necessary to align the laser beam L on the aperture of the lens 3, but not on a much smaller opening a pre-screwed diaphragm, which required the effort for the

Positioning of a laser beam projection device 20 to be checked considerably reduced.

The laser beam L is imaged directly on the lens 3 in the image plane 4 on the image sensor 5, without

interposed intermediate image plane and eyepiece.

This also eliminates all problems that required for a satisfactory measurement accuracy accurate positioning and positional stability of a

Eyepieces are connected, as well as a fault susceptibility to vibration.

FIG. 3 shows a possible embodiment of a laser beam horizontality inspection device 10 according to the invention, as illustrated in FIG. 2 with essential basic components, for a laser beam projection device for works in building and / or interior construction, the laser beam projection device having a Beam self-leveling functionality is equipped. The

Laser beam horizontality fidelity checking device 10 in turn has a telescope 1 with an attenuation filter 2, an enlarging acting lens 3 and a flat image sensor 5 for receiving an image of an incident on the lens 3 laser beam L.

Components of the Laserstrahlhorizontalitätstreue checking device 10 are also a self-inclination compensator 6 and an evaluation unit 7, which is designed for automatically carrying out a determination of a

Image position of the laser beam L recorded in the image based on image processing. According to the invention, the planar image sensor 5 is again arranged in an image plane 4 of the objective 3, and the evaluation unit 7 is additionally designed according to the invention for quantifying the laser beam horizontality with a translation of the determined image position into a laser beam slope value on the basis of a translation rule associated with calibration parameters from one

Position of the image sensor 5 in the telescope 1 are dependent.

By the latter additional features of

Evaluation unit 7 is advantageous, in contrast to the prior art, allows to quantify the extent of a deviation of a laser beam from the Horizontalitätstreue and even still, in particular based on the

Quantitative nature of the specific deviation data to gain clues for a diagnosis and identification of the cause of such deviations. This will be demonstrated below in another experimentally performed example.

According to the embodiment shown in FIG

laser beam horizontality scattering

Verification device 10, the attenuation filter 2 is formed such that a plurality of different Attenuation levels is provided, from which

a degree of attenuation is selectable and adjustable on the user side, or a degree of attenuation is automatically selected and set by evaluation of a test image recorded by the laser beam L incident in the objective 3. Preferably, the attenuation filter 2 is designed such that in each case a degree of attenuation is infinitely selectable and adjustable in a wide attenuation range. In particular, the attenuation filter 2 may comprise at least one rotatably arranged linear polarizer, in particular two or more relatively rotatable linear polarizers (indicated by a double arrow in FIG. 3). In the case where the laser radiation to be detected is already linearly polarized, a linear polarizer is already sufficient to achieve the widest possible attenuation range, ie. between 0% (parallel polarization) and 100% (crossed polarization)

Polarization). Furthermore, it is preferred that the attenuation filter 2 be substantially

uniformly over the entire lens cross-sectional area as an aperture extends.

In addition to the arrangement according to FIG. 2, according to the embodiment shown in FIG. 3, a focusing element 8 arranged in the beam path downstream of the objective 3 is provided in the telescope 1, which is axially adjustable and for which a specific defined focus position is stored in the calibration parameters may be, for which applies that parallel to each other and incident in the lens rays - regardless of an aperture impact point over the entire aperture of the lens - each in a same single point on the image plane together fall and be imaged and thus captured by the image sensor in a single, same pixel.

In addition, according to this embodiment, the telescope 1 has a beam path arranged in the beam path 9 for splitting the beam path into a first channel 11 and a second channel 12 such that in the first channel 11, a first image plane 4 of the lens 3 and in the second channel 12 a second Image plane 4 'of the lens 3 is generated. In this case, the image sensor 5 is arranged in the first image plane 4, and in the second image plane 4 'are an indicator for the optical axis A supporting optics 13, in particular with crosshairs, and one of these optics 13 downstream eyepiece 14 for the eye of a user taking into account the intermediate image produced in the second image plane 4 '.

As a self-inclination compensator may, for example, an electronic inclination observer with a

high-precision inclination sensor 6 can be used for

Determining a dependent of a current tilt position of the telescope 1 telescopic tilt value. Of the

Telescopic inclination value is then automatically taken into account by the evaluation unit 7 at an automatic

carried translation of the image position in one

Laser beam slope value. Fig. 4 shows a further embodiment of a

according to the invention LaserStrahlhorizontalitätstreue- Verification device 10, wherein the

Eigenneigungskompensator - as known in the art per se - is designed as an opto-mechanical

Selbsthorizontierer 6 'with a in the beam path of the

Telescope 1 between the lens 3 and the image sensor. 5 arranged opto-mechanical element for

Self-horizontalization of the optical axis A of the telescope 1. The image sensor 5 is again in the image plane 4

arranged. According to this embodiment, the

Leveling the Laserstrahlhorizontalitätstreue- review device 10 on an alignment of the

Beam path in the telescope 1 by means of reflective

Components 18, 19a, 19b, for example, formed as mirrors or prisms, which are part of the

Self-horizontalizer 6 'are. Specifically, two are consecutive along the optical axis A.

Components 19a, 19b are fixedly arranged substantially along the optical axis, and the reflecting component 18 is rotatable with respect to the direction of the optical axis A so as to be based on optical signals

Self-horizontalization of the Laserstrahlhorizontalitätstreue- checking device 10 to enable. Optionally, the image of the laser beam L is displayed on a micro-display 17, which may optionally be viewed through an eyepiece, not shown here, or one (e.g., either directly on the

Arranged telescope or arranged on a separate control and evaluation unit with user interface)

Touchscreen displayed.

FIGS. 5 and 6 show possible forms of representation of the recorded image of the laser beam L. In FIG. 5, an image L 'of the laser beam L with a (central) image position L'C determined therefor and a fictitious image A' as a calibrated imaging position are shown in FIG see optical axis A of the lens 3. In addition, a direction Z is shown, which, for example, indicates the calibrated direction in the image, which for a hypothetical - by a pure Horizontality error caused - offset direction of a laser beam impact position on the image sensor is.

Based on this recorded image (ie on the basis of

Image data), the image L 'of the laser beam L can now be evaluated by image processing with regard to a punctiform mean image position of the spot L'; e.g. by focusing or by the following method:

° bring a selected and corresponding to the shape of the spot L 'pattern using a best-fit method in the image in image positional match with the spot L', in particular with subpixel accuracy, and

° Determine the image position L'C using the in

Matched location of the pattern in the image, as well as in particular with subpixel accuracy. In this method, in particular for each stored pattern, information can be stored with it, which allows a pattern position defined within the pattern to be derived for the final determination of the image position L'C to be derived within the pattern

Special where the information is the pattern internal

defined pattern position itself or a defined pattern position determination algorithm such as a

Pattern centroid determination algorithm.

This determined image position L'C can now - under

Taking into account the information stored in the calibration parameters about the imaging position of the optical axis A of the objective 3 and about the direction Z - are evaluated with respect to an incident direction of the laser beam, in particular with respect to a pure

Slope value of the laser beam. For this, the (pixel) distance present in the image is determined by the image position L'C to the imaging position of the optical axis A, and this distance is fictitiously projected onto the calibrated direction Z (compare scalar product from FIG

Mathematics) . The projected on this direction Z

Component ΔΖ of the determined distance is then directly for a directional deviation of the incident laser beam from the horizontal, so that this component in a

Slope value for the laser beam can be translated. Summarized is thus for the translation of the

Image position L'C thus one in the picture between the image position L'C and the imaging position A 'in that

Direction Z existing distance ΔΖ determined that as

Direction is assumed or stored in the Kalibrierparametern, which stands for a - hypothetically caused by a pure horizontality error - offset direction of a laser beam impact position on the image sensor. This distance is then finally translated into the laser beam slope value, in particular according to a translation factor defined by the objective mapping ratio.

Alternatively to the case that in the calibration parameters information about the imaging position A 'of the optical axis A of the lens 3 and the direction Z

For example, one can also - especially in the picture over the entire image area in the

Essentially horizontally extending - zero inclination line be deposited in the image. This zero inclination line indicates in which (pixel) positions on the image sensor in each case with slightly varying azimuthal direction, but each strictly horizontal incident rays are imaged. This calibrated line is, as explained above due to the arrangement of the image sensor in the image plane, according to the invention even independent of each

Entry points into the aperture of the lens. Using such calibration parameters, a distance existing in the image between the image position L'C and the calibrated zero inclination line can now be determined for the translation of the image position L'C. This distance then becomes direct - especially again

in accordance with a translation factor defined by the lens mapping ratio - translated into the laser beam slope value.

As a further alternative, a preprocessed look-up table can be stored directly as a calibration parameter from which an assigned laser beam tilt value is stored directly for respective image positions.

Using such calibration parameters, the laser beam slope value assigned in the look-up table of the determined image position L'C can then be directly read out for the translation of the image position L'C.

In all cases, the laser beam tilt value may be outputted, for example, as the inclination angle of the laser beam (e.g., in degrees / minutes / seconds or percent slope). FIG. 6 illustrates a possible further processing of the image data according to FIG. 5, wherein the image position L'C

can additionally be evaluated with respect to an azimuthal direction of incidence. This evaluation option may be particularly relevant for additional verification of an azimuth directionality of an emitted laser beam, for example from a total station or a laser tracker as a laser beam projection device designed as a point laser.

A possible procedure can be that in a first position (face 1) of the beam steering unit of

Total Station / laser tracker a first Azimutalrichtungswert for the laser beam is determined, the beam steering unit of Totalstation / laser tracker is then turned over to the second layer (Face 2), ie where the beam steering unit - in a person skilled in the known manner - in the two axes of rotation respectively is swung around by exactly 180 °, and in this second position (Face 2) of the beam steering unit of Total Station / Lasertracker again a second Azimutalrichtungswert for the laser beam is determined on the basis of the inventive VerificationVorrichtung.

A difference between the first and second determined azimuthal direction values can then be used to establish and quantify an azimuthal

Direction error and thus the Azimutalrichtungstreue the laser beam of the total station or the laser tracker.

Also for this functionality to check a

Laser beam azimuth will be a through the

Image sensor taking a picture of the incident laser beam in the lens triggered and performed automatically by the evaluation

A determination of an image position L'C of the image L 'of the detected laser beam present in the image (this being exactly as in the above in connection with Figure 5 above descriptions can be made) and

• A quantification of laser azimuth accuracy with a translation of the determined image position L'C into one

Laser beam azimuth direction value based on one of the stored calibration parameters

Translation rule.

For this purpose, the following information can be stored as calibration parameters (in addition to the information mentioned in connection with FIG. 5):

° an imaging position A 'of the optical axis in the image and in particular a direction X in the image, which stands for a - hypothetical by a pure azimuthal direction deviation from the optical axis effected - offset direction of a laser beam impact position on the image sensor

(this option is shown in FIG. 6),

° a - in particular in the image over the entire image area substantially vertically extending - zero-azimuthal deviation line in the image (where line indicates in which (pixel) positions on the image sensor with slightly varying elevative direction, but each strictly strictly in the azimuthal direction optical axis incident rays are imaged), and / or

° a look-up table, from which for each

Image positions directly an associated laser beam Azimutalrichtungswert is stored.

Depending on which parameters are respectively stored, in each case for the translation of the determined image position L'C into a laser beam Azimutalrichtungswert ° in the picture between the image position L'C and the

Imaging position A 'of the optical axis in that direction existing distance ΔΧ are determined, which is assumed as a direction or stored in the calibration parameters, for a - hypothetical by a pure azimuthal direction deviation from the optical axis caused - offset direction of a laser beam impact position on the Image sensor is, and this distance ΔΧ - in particular according to a translation factor defined by the lens imaging ratio - in the laser beam

Azimutalrichtungswert be translated (this option in the case shown in Figure 6), respectively

A distance existing in the image between the image position and the zero azimuthal deviation line is determined, and this distance is translated into the laser beam azimuth direction value, in particular according to a translation factor defined by the objective imaging ratio

° of the in the look-up table of the determined image position of the associated laser beam Azimutalrichtungswert

be read out.

In all cases, the laser beam azimuth direction value (ie, as a value for a relative azimuth ^direction , ie, an azimuthal direction of the incident beam) can be used

Laser beam relative to the direction of the optical axis), for example, as a relative azimuth angle of the laser beam (e.g., in degrees / minutes / second).

Figures 7 and 8 show examples of the detection of deviations of the emission curve of a rotating

Laser beam or a laser beam fan of the Horizontality. In this case, the reference numeral 22, the measured image of the generated by the rotating laser

Reference level and with 21 determined course and

Position of the reference plane line, over a certain azimuthal angle range X, marked. The course according to FIG. 7 indicates the presence of a deviation of

Reference plane of the horizontality corresponding to a tilt or inclination relative to a horizontal plane. This may correspond to an error to be corrected in the adjustment of the laser, but may also correspond to a deliberately obliquely spanned reference plane. In this case, the laser beam horizontality fidelity checking device of the present invention can be detected by evaluating the projection line generated by the rotary laser beam on the image sensor, e.g. to check the

Plane fidelity of the inclined reference plane and

if necessary, their readjustment to a desired setpoint value is used (for which purpose-as described in more detail in conjunction with ^FIGS. 9a, 9b and 10-an image recording can advantageously take place at several points of the laser plane).

The course according to FIG. 8 can be the presence of e.g. of a so-called saddle error, i.e. that the

Laser beam is not precisely rotated in a plane, but changes the inclination of the laser beam at a certain rotational position and then back to a

Output value returns. With that too can

Fehlj ustierungen of the laser beam, with possibly even possible conclusions on underlying

Causes of failure, to be diagnosed. The course according to FIG. 8 corresponds to one in practice rather

unlikely situation that the laser beam Projection device and the telescope are exactly aligned with each other so that the rotational position corresponding to the saddle crest, approximately in the middle of the

Image sensor detected azimuthal angle range occurs. For the systematic, targeted determination of a plane or saddle error, a procedure is preferred in practice, which is illustrated with reference to the figures 10a, 10b and 11.

As can be seen with reference to FIG. 9, the

Device according to the invention also for checking

whether a target-vertical plane generated by a laser beam projection apparatus is actually faithfully vertical.

For this purpose, the inventive laser beam horizontality fidelity checking device can also have a functionality for checking a level verticality fidelity. This is especially applicable for such special ones

Laser beam projection apparatus, which are suitable for clamping a vertical plane by the emitted laser beam. For example, this may be a rotation laser with laydown-position functionality, which - in the

Expert in a conventional manner - in a lay-down position for rotating about a horizontal axis

Transmission of the laser beam and thus formed to produce a vertical plane, wherein the

Vertical adjustment of the level thereby automatically by the

Rotation laser and an integrated in the rotary laser provided self-Vertikalisier mechanism can be done.

As another example of such to be checked

Laser beam projection device can also be a Line laser, which is designed to emit a vertically fanned laser beam come into question.

As part of the functionality for verifying the levels of verticality loyalty, one can again be used by the

Image sensor taking a picture of the laser beam incident into the lens be triggered (or automatically triggered) and automatically performed by the evaluation: · a determination of image position information on an image 22 generated in the image by the detected laser beam from the vertical plane by image processing .

in particular wherein as image position information a

Position and a course of a defined by the laser beam in the image plane line 21 is determined based on a processing of the image 22, and

A quantification of the verticality fidelity as a function of the determined image position information and as a function of the stored calibration parameters, in particular by comparison of the course of the plane line 21 with a direction Z in the image, which for a hypothetical effect caused by a purely elevative directional deviation from the optical axis, Offset direction of a laser beam impact position is on the image sensor. A pure (left-right) offset of the image-detectable plane line 21 from an image center can be used for this

Functionality is irrelevant. It is essential for the evaluation in the context of this functionality, whether the course of the plane line 21 (ie the direction of the course of the line in the picture) parallel to the calibrated Direction Z (in which case the verticality can be confirmed), and if not, how much the direction of the course of the plane line 21 in the image differs from the direction Z (which then becomes an (angle) value for the deviation from the verticality can be translated).

Fig. 10a illustrates a survey of

Horizontality of the laser beam projection device 20 by positioning an inventive

Alternatively, as shown in FIG. 10b, the laser beam horizontality scattering verification apparatus 10 may be fixed, for example, on a platform 24, and the one to be inspected may be located at four different positions in the vicinity of the laser beam projection apparatus 20

Laser beam projection device 20 relative to the device 10 rotatable on a rotatable platform and

for example, to be mounted together on the same platform as the laser beam horizontality verifying device 10. This advantageously allows the

Horizontality and / or plane fidelity of the light emission by the laser beam projection device 20 continuously over a complete solid angle range of 360 ° the relative orientation of Laserstrahlhorizontalitätstreue- Verification device 10 and laser beam projection device 20 to each other to measure (or punctually for example in eight or sixteen different angular positions).

FIG. 11 illustrates possible measurement results generated from the arrangement shown in FIG. 10a or FIG. 10b for mutual positioning of the laser beam horizontality scattering inspection apparatus and the FIG

Laser beam projection device to each other at angles of 0 °, 90 °, 180 ° and 270 °. In this case, as indicated here, in each case both the center position L'C of the laser beam and the profile 21 of the reference plane 22 generated over the respectively detected azimuthal angle range can be measured and evaluated. The situation illustrated here, with a maximum (in terms of the Z direction) of the

Laser beam impact position L'C at 0 °, a minimum at 180 ° and a continuous oblique course in the angular range therebetween (at 90 ° and 270 °), e.g. on the presence of a plane error (ie an unwanted slight inclination of the generated plane relative to a strictly horizontal plane), which in particular from the

Aggregation of information from the four individual

Can determine images. With these last described figures is a

Embodiment of an inventive Laserstrahlhorizontalitatstreue-Überprüf device illustrated, which has a functionality for checking a

Level loyalty especially for such a trained

Laser beam projection device which, for

Clamping a reference plane with the laser beam

is formed, in particular for a trained as laser fan line laser or rotary laser laser beam projection device. It is under the

Functionality for checking the fidelity of a taking place by the image sensor recording an image of the laser beam incident into the lens, and by the evaluation are automatically the following

Steps performed: - Determination of image position information on an image 22 generated in the image by the detected laser beam from the reference plane by image processing, in particular a position and a course of a reference plane line 21 defined by the laser beam in the image being determined on the basis of a processing of the image, and quantification of the plane fidelity depending on the determined image position information as well as on the stored calibration parameters.

Additionally or alternatively, at different reference plane locations by the image sensor, images of the laser beam incident at the respective reference plane locations can be recorded, and the evaluation unit then automatically performs: a determination of a respective image position L'C of the respectively recorded laser beam for the respective laser beam several images and a quantification of the level of fidelity by aggregation of the respective determined image positions, in particular taking into account the respective

Reference plane locations at which the respective images are taken, as well as dependent on the stored calibration parameters.

FIG. 12a shows an example of a quantitative measurement result for a measurement of a rotating laser with a laser beam horizontal accuracy test device according to the invention. FIG. 12b shows an enlarged detail thereof. The laser beam IIa is imaged in the region of the x-z axis intersection. There is an offset in the z-direction recognizable. By a

Magnification, as shown in Figure 12b, it can also be seen that the laser beam is not completely horizontal runs, but has a deviation from the Horizontaliät, the extent of which can be determined by a linear fit IIb. Furthermore, small deviations from a linearity that manifest themselves, for example, in a local maximum 11c, can also be diagnosed with the laser beam horizontality checking device according to the invention.

Figures 13a and 13b show real, quantitative resulting ^¬ nit for the measurement of a rotating laser with an inventive LaserStrahlhorizontalitätstreue-over- tester, with the height Z of the imaging of the laser beam on the image sensor as a function of the swept azimuthal angle Eich X. The scale of the axes X and Z is in values of pixels of the image sensor, with one pixel in an azimuthal angle range of 6.5 arc seconds

equivalent. The range shown in FIG. 12a in the X direction therefore corresponds to an azimuthal angle range of 2835 arc seconds, and the image sensor was thereby included

Measured values in a Z range between 601.7 and 602.4

Pixels, corresponding to a range of 4.4 seconds of arc. The exposure time of the image sensor should be e.g. correspond to a full revolution of the rotating laser beam. Noteworthy is the very high resolution of the inventive measuring arrangement. The rapidly oscillating line 28 represents the course of the current measured values for the respective slope value (or the respective

Horizontal deviation) of the incident laser beam as a function of the azimuthal angle, and the solid line 29 represents a linear fit, for example, by the method of the sum of the smallest squared deviations, of these measured values.

First, there is a slight negative slope of the trace from low X pixel values to higher ones X pixel values can be read out, which can indicate either a saddle or a plane error for a locally decreasing inclination deviation of the respective incident laser beam from horizontality and thus - globally or over a large part or even the entire circumference.

Experience has shown that a saddle error leads to a deviation of typically 10 to 20 seconds of arc, considered over a wider angular range of e.g. 90-180 °.

On the other hand, a pronounced elevation of about 600 pixels in the X-direction occurs, which corresponds to a sudden electoral deviation of direction from the fitted baseline in the amount of about two arcseconds.

With the here registered deviation of about 2

Arc seconds of a linear course can be

more likely the presence of a minor one

Diagnose disorder, such as a bearing error of the rotating deflection of the rotating laser.

Fig. 13b illustrates the reproducibility of

Measurement results, each resumed by exposure of the image sensor during a full round trip of the

Rotating laser. Shown is the course of the

Measurement results at the first round (curve 28a), 70th round

(Curve 28b) and 140th round (curve 28c). Noteworthy is the extraordinarily high reproducibility of the

Measurement results, in particular concerning fluctuations of a course corresponding to the horizontality over the swept azimuthal angle range. With regard to the noticeable slight increase or drift of the Z-values, between the 1st and the 140th round, it is pointed out pointed out that this change is only a maximum of 0.1 pixels corresponding to 0.6 arc seconds.

In particular, the real experimental data of Figs. 13a and 13b further demonstrate that the inventive laser beam horizontality fidelity checker

is capable of data with an accuracy in depth

Subpixel area, i. of significantly less than 0.1 pixels.

It is understood that these illustrated figures represent only possible embodiments schematically. The various approaches may also be combined with each other as well as with prior art methods.

Claims

Patent claims

1. Laser beam horizontality fidelity checking device (10) for a beam horizontal functionality,

in particular a jet

Self-horizonting functionality, having

Laser beam projection device (20) for work in construction and/or interior work, in particular a rotating laser or a line or point laser, whereby the

Laser beam horizontality fidelity

Has checking device (10).

• a telescope (l) with

° an attenuation filter (2),

° a magnifying lens (3), which defines an optical axis (A), and

° a flat image sensor (5) arranged in an image plane (4) of the lens (3) for recording an image of an image in the lens (3)

incident laser beam (L),

· a tilt compensator (6, 6') and

• an evaluation unit (7) designed for

automatic execution of

° determining an image position of the laser beam (L) recorded in the image based on

Image processing and

° a quantification of the

Laser beam horizontality fidelity with one

Translation of the determined image position into a laser beam inclination value based on a

Translation rule that comes with from a position of the

Image sensor (5) in the telescope (1).

Calibration parameters are related.

2. Laser beam horizontality fidelity checking device (10) according to claim 1,

characterized in that

the attenuation filter (2) is designed such that a variety of different

Degrees of attenuation are provided, from which

• a degree of attenuation can be selected and adjusted by the user or

• by evaluating a test image created by the laser beam (L) incident on the lens (3).

recorded, a degree of attenuation is automatically selected and set,

in particular where

• the attenuation filter (2) is designed in such a way that a degree of attenuation can be continuously selected and adjusted in a wide range of attenuation, in particular whereby the

Attenuation filter (2) has at least one rotatably arranged linear polarizer, in

Special two or more linear polarizers arranged to rotate relative to one another,

and or

• the attenuation filter (2) essentially

evenly over an entire

Lens cross-sectional area extends as an aperture.

3. Laser beam horizontality fidelity checking device (10) according to claim 1 or 2,

characterized in that

the telescope (1) is designed to be aperture-free and the image sensor (5) and the lens (3) are designed in such a way

Telescope (1) is arranged to cooperate through the image sensor

(5) an incident one

Laser beam (L) can be detected as an aperture over at least a large part of the objective cross-sectional area, in particular essentially over the entire

Lens cross-sectional area.

Laser beam horizontality fidelity checking device (10) according to one of claims 1 to 3,

characterized in that

• the telescope (1) is also in the beam path

Lens (3) has a downstream focusing element (8),

and or

• the inclination compensator (6,

6') is designed as an opto-mechanical self-leveling device (6') with an opto-mechanical element arranged in the beam path of the telescope (1) between the objective (3) and the image sensor (5) for self-leveling the optical axis of the telescope (1 )

or

° as an electronic slope taker

a high-precision inclination sensor to determine one of the current inclination positions of the

Telescope (1) dependent telescope inclination value, whereby the telescope inclination value is determined by the

Evaluation unit (7) is automatically taken into account in the automatically carried out translation of the image position into the laser beam inclination value.

Laser beam horizontality fidelity checking device (10) according to one of claims 1 to 4,

characterized in that the stored calibration parameters stand for

• an imaging position (Α') of the optical axis (A) in the image and in particular a direction in the image that is for a - hypothetically through a pure

Horizontality error caused - offset direction of a laser beam impact position on the

Image sensor (5) is stationary,

• one - especially in the picture over the entire

Image area essentially horizontal - zero slope line in the image,

and or

• a look-up table from which for each

An assigned laser beam inclination value is stored directly for each image position.

Laser beam horizontality fidelity checking device (10) according to claim 5,

characterized in that

for the translation

• an in the image between the image position and the

Image position in that direction

Distance is determined, which is assumed as the direction or is stored in the calibration parameters for a - hypothetically by a pure

Image sensor (5) is stationary,

and this distance - in particular according to a translation factor defined by the lens imaging ratio - is translated into the laser beam inclination value,

respectively a distance existing in the image between the image position and the zero inclination line is determined, and this distance is translated into the laser beam inclination value - in particular in accordance with a translation factor defined by the lens imaging ratio,

respectively

the one determined in the look-up table

Laser beam inclination value assigned to the image position is read out,

in particular, the laser beam inclination value is output as the inclination angle of the laser beam (L).

7. Laser beam horizontality fidelity checking device (10) according to one of claims 1 to 6,

characterized in that

• for the evaluation unit (7) in a memory

available for different

Laser beam cross-sectional shapes each have a pattern, in particular a template, stored,

• one with the laser beam cross-sectional shape of the

The pattern corresponding to the incident laser beam (L) can be selected by the user or automatically through image processing with feature recognition

is selected,

• and by the evaluation unit (7) when determining the image position

° the selected pattern using a best fit method in the image with the captured one

Laser beam (L) is brought into agreement, in particular with sub-pixel accuracy, and ° based on the aligned position of the pattern in the image, the image position of the image in the image

recorded laser beam (L) is determined, in particular with sub-pixel accuracy,

• In particular, for each saved pattern, information is stored that defines an internal pattern for the ultimate determination of the

Image position Sample position to be used

can be derived within the pattern, in particular where the information is the pattern position itself defined internally in the pattern or a defined one

Pattern position determination algorithm such as a pattern center of gravity determination algorithm.

Laser beam horizontality fidelity checking device (10) according to one of claims 1 to 7,

characterized in that

the telescope (1) further has a beam splitter (9) arranged in the beam path for dividing the

Beam path into a first channel (11) and a second channel (12) such that in the first channel (11) there is a first image plane (4) of the lens (3) and in the second channel (12) there is a second image plane (4 ^' ) of the

Lens (3) is generated, whereby

• in the first image plane (4) the image sensor (5) and

• in the second image plane (4') an optics (13) carrying an indicator for the optical axis,

in particular with crosshairs, and an eyepiece (14) arranged downstream of this optics 813) for viewing the intermediate image generated in the second image plane (4 ^' ) with the eye of a user. Laser beam horizontality fidelity checking device (10) according to one of claims 1 to 8,

characterized in that

the laser beam horizontality accuracy

Checking device (10) also has a functionality for checking a laser beam azimuth fidelity specifically for a laser beam projection device (20) designed in this way, which emits a laser beam (L ') which has a cross-section that can be viewed as a point in a macro perspective, within the scope of the functionality Checking the laser beam azimuth fidelity by recording an image of the in the by the image sensor (5).

Lens (3) incident laser beam (L) can be triggered and automatically by the evaluation unit (7).

be performed

• a determination of an image position of the in the image

recorded laser beam (L) and

• a quantification of the laser beam azimuth fidelity with a translation of the determined image position into a laser beam azimuthal direction value based on a translation rule dependent on the stored calibration parameters,

in particular, the saved ones

Calibration parameters stand for

° an imaging position of the optical axis in the image and in particular a direction in the image that is - hypothetically by a pure azimuthal

Directional deviation from the optical axis

caused - offset direction of a laser beam impact position on the image sensor (5), ° one - especially in the picture over the entire

Image area essentially vertical - zero azimuthal deviation line in the image,

and or

° a look-up table from which for each

An assigned laser beam azimuthal direction value is stored directly for each image position,

and for translation

° on in the image between the image position and the

Image position in that direction

Distance is determined, which is assumed as the direction or is stored in the calibration parameters, which is for an offset direction of a laser beam - hypothetically caused by a pure azimuthal directional deviation from the optical axis.

The impact position is on the image sensor (5), and this distance - in particular according to a translation factor defined by the lens imaging ratio - in the

Laser beam azimuthal direction value is translated, respectively

° a distance existing in the image between the image position and the zero azimuthal deviation line is determined,

and this distance - in particular according to a translation factor defined by the lens imaging ratio - in the

Laser beam azimuthal direction value is translated, respectively

° the determined in the look-up table

Image position the assigned laser beam azimuthal direction value is read out, in particular where the laser beam

Azimuth direction value is output as the angle of the laser beam (L).

Laser beam horizontality fidelity checking device (10) according to one of claims 1 to 9,

characterized in that

the laser beam horizontality accuracy

Checking device (10) also has a functionality for checking laser beam inclination fidelity specifically for a laser beam projection device (20) designed in this way, which has a beam inclination function with a user-defined, selectable and - in particular automatically adjustable - target inclination for the laser beam

has, in particular for a laser beam projection device (20) designed as a tilt-rotation laser with an automatic single or dual slope mechanism,

whereby as part of the functionality for checking the laser beam inclination fidelity, after setting the

defined target inclination for the laser beam (L) on the laser beam projection device (20), one through the

Image sensor (5) recording of an image can be triggered by the laser beam (L) incident into the lens (3) and by the evaluation unit (7)

be carried out automatically

• a determination of an image position of the in the image

recorded laser beam (L) and

• a quantification of the laser beam inclination fidelity with a translation of the determined image position into a laser beam inclination value based on a value dependent on the stored calibration parameters Translation rule, so that the resulting one

Laser beam inclination value with the defined on

Laser beam projection device (20) is comparable to the target inclination set.

Laser beam horizontality fidelity checking device (10) according to one of claims 1 to 10,

characterized in that

• the evaluation unit (7) as a control and

Evaluation unit is designed and one after

Triggering is completely automatic

Functionality for checking the

Laser beam horizontality fidelity is provided, within the scope of which is controlled by the control and

Evaluation unit one through the image sensor (5)

taking a picture of the in that

Lens (3) automatically initiates the incident laser beam (L) and then automatically

Carrying out the determination and quantification is started,

• in particular where the functionalities are also available

Checking the laser beam azimuth fidelity

or the laser beam inclination fidelity as being completely automatic after triggering

Functionalities are provided and, controlled by the control and evaluation unit (7), the image sensor (5) automatically initiates the recording of an image of the laser beam (L) incident into the lens (3) and

then automatically carrying out the

Determination and quantification is started. Laser beam horizontality fidelity checking device (10) according to one of claims 1 to 11,

characterized in that

the laser beam horizontality accuracy

Checking device (10) also has a functionality for checking level fidelity specifically for a laser beam projection device (20) designed in this way.

which is designed to clamp a reference plane with the laser beam, in particular for a line laser that emits a laser fan or

Laser beam projection device (20) designed as a rotating laser,

whereby as part of the functionality for checking level fidelity

• a recording of an image of the laser beam (L) incident into the lens (3) can be triggered by the image sensor (5) and by the

Evaluation unit (7) can be carried out automatically

° a determination of image position information via an image of the reference plane generated in the image by the detected laser beam (L).

Image processing, especially where as

Image position information a position and a

The course of a reference plane line defined by the laser beam (L) in the image is determined by processing the image, and

° a quantification of the level fidelity depending on the determined image position information as well as depending on the stored calibration parameters, and / or

• at different reference plane locations through the image sensor (5) images of the respective The laser beam (L) incident in the lens (3) can be recorded at each reference plane point and is carried out automatically by the evaluation unit (7).

° a determination of a respective image position of the respectively recorded laser beam (L) for the respective multiple images and

° a quantification of the level fidelity

Aggregation of the respective determined

Image positions, in particular taking into account the respective reference plane locations at which the respective images are recorded, as well as depending on the stored calibration parameters.

Laser beam horizontality fidelity checking device (10) according to one of claims 1 to 12,

characterized in that

the laser beam horizontality accuracy

Checking device (10) also has a functionality for checking plane verticality fidelity specifically for a laser beam projection device (20) designed in this way, which is used to clamp a laser beam using the emitted laser beam

vertical plane is suitable, in particular for a laser beam projection device (20) designed as a rotating laser with lay-down position functionality or as a vertical laser fan-emitting line laser, wherein as part of the functionality for checking the plane verticality fidelity, a recording is made by the image sensor (5). of a picture of that in that

be performed • a determination of image position information via an image of the vertical plane generated in the image by the captured laser beam (L).

Image processing, especially where as

Image position information a position and a

The course of a plane line defined in the image by the laser beam (L) is determined by processing the image, and

• a quantification of the verticality fidelity depending on the determined image position information and depending on the stored calibration parameters, in particular by comparing the course of the plane line with a direction in the image, which is - hypothetically caused by a purely elevative ^directional deviation from the optical axis - Offset direction of a laser beam impact position on the image sensor (5).

System (100) consisting of a laser beam horizontality fidelity checking device (10) according to one of claims 1 to 13 and a laser beam projection device (20) having a beam self-horizonting functionality for work in construction and/or interior work, in particular rotary laser or line or point laser,

in particular, wherein the laser beam horizontality fidelity checking device (10) and the laser beam projection device (20) each have a data communication interface, and wherein the

Laser beam horizontality fidelity checking device (10) is designed to generate data dependent on the laser beam inclination value and to communicate this data to the laser beam projection device (20), so that the beam horizontaling function nality, in particular beam self-horizonting ^{functionality} , of the laser beam projection device (20) can be recalibrated based on the data obtained from this,

in particular, the laser beam ^projection device (20) for automatic automatic

Recalibration of its beam leveling functionality, in particular beam self-horizonting functionality, is formed based on the data obtained.

Method for checking the laser beam horizontality fidelity of a laser beam projection ^device (20) having a beam self-horizonting functionality, which is used for work in construction and/or

Interior design is designed, in particular rotating lasers or line or point lasers,

wherein the method is carried out using a telescope (1) which has

• an attenuation filter (2),

• a magnifying lens (3) and

• one in an image plane (4) of the lens (3)

arranged flat image sensor (5) for capturing an image from a lens (3)

incident laser beam (L),

and being carried out as part of the procedure

• compensating for an inclination of the telescope (1),

• taking a picture of one in the

Lens (3) incident laser beam (L),

• Determining an image position of the in the image

recorded laser beam (L) based on

Image processing and

• a quantification of the

Laser beam horizontality fidelity with one translation the determined image position into a laser beam inclination value based on a translation rule that depends on a position of the image sensor (5).

Telescope-dependent calibration parameters

is related.